[Python tutorial] 25. File Methods

file.close()

Closes the file

f = open("demofile.txt", "r")
print(f.read())
f.close()

file.fileno()

Returns a number that represents the stream, from the operating system's perspective

f = open("demofile.txt", "r")
print(f.fileno())

file.flush()

Flushes the internal buffer

f = open("myfile.txt", "a")
f.write("Now the file has one more line!")

f.flush()
f.write("...and another one!")

file.isatty()

Returns whether the file stream is interactive or not

f = open("demofile.txt", "r")
print(f.isatty())

file.read()

Returns the file content

f = open("demofile.txt", "r")
print(f.read())

file.readable()

Returns whether the file stream can be read or not

f = open("demofile.txt", "r")
print(f.readable())

file.readline(size)

Returns one line from the file

f = open("demofile.txt", "r")
print(f.readline())

file.readlines(hint)

Returns a list of lines from the file

f = open("demofile.txt", "r")
print(f.readlines())

file.seek(offset)

Change the file position

f = open("demofile.txt", "r")
f.seek(4)
print(f.readline())

file.seekable()

Returns whether the file allows us to change the file position

f = open("demofile.txt", "r")
print(f.seekable())

file.tell()

Returns the current file position

f = open("demofile.txt", "r")

print(f.tell())

file.truncate(size)

Resizes the file to a specified size

f = open("demofile2.txt", "a")
f.truncate(20)
f.close()

#open 
and read the file after the truncate:
f = open("demofile2.txt", "r")

print(f.read())

file.writable()

Returns whether the file can be written to or not

f = open("demofile.txt", "a")
print(f.writable())

file.write(byte)

Writes the specified string to the file

f = open("demofile2.txt", "a")
f.write("See 
you soon!")
f.close()

#open 
and read the file after the appending:
f = open("demofile2.txt", "r")

print(f.read())

file.writelines(list)

Writes a list of strings to the file

f = open("demofile3.txt", "a")
f.writelines(["See 
you soon!", "Over and out."])
f.close()

#open 
and read the file after the appending:
f = open("demofile3.txt", "r")

print(f.read())